Share your favorites on Show & Tell

Famous Rozenburg eggshell

In Pottery > Show & Tell.
Bert's items2 of 12Leerdam Unica Copier EYEVelsen aardewerk
Love it
Like it

kwqdkwqd loves this.
auraaura loves this.
vetraio50vetraio50 loves this.
aghcollectaghcollect loves this.
SEAN68SEAN68 loves this.
artisloveartislove loves this.
maryh1956maryh1956 loves this.
AneiworAneiwor loves this.
See 6 more
Add to collection

    Please create an account, or Log in here

    If you don't have an account, create one here.

    Create a Show & TellReport as inappropriate

    Posted 11 years ago

    (12 items)

    I show you a fine example of a masterpiece of Eggshell porcelain with 2 parrots. Unfortunately it's broken but nevertheless a great piece;

    Eggshell porcelain is named after the skin of the shard, which is so extremely thin that it is slightly transparent. Many experts have racked their brains over the question whether the material was real porcelain. Originally it was assumed that the pigments of the decorations couldn't withstand temperatures of over 1300 degrees C. This led to the conclusion that the material must have been baked at lower temperatures, and could therefore not be porcelain. Porcelain - which first got its name from Marco Polo (1254-1324) - was already developed in China in 600-900 AD. The production method of this popular material had been shrouded in mystery for centuries, and Europe had to rely on import from Asia until, in the early 1700s, J.F. Bottger invented the European hard-paste porcelain. Notably, this variety was baked at much higher temperatures than the Chinese material: 1370-1460 degrees C against 1000-1320 degrees C. Not everyone was charmed by this hard-paste porcelain (which the English call Dresden China) and in a number of countries softer material was developed, which - after the Chinese example - was baked at lower temperatures, e.g. in Scandinavia, in France (Pate Nouvelle) and in England (Bone China). After a few failures with Bone China, Kok started to experiment with a material that had been developed by Prof. Dr. H. Seger in Berlin. Which of the two types of porcelain clay he actually used is not entirely clear, but in the factory archives the composition was found: 19% Cornwell stone, 31,6% china clay, and 49,4% bone meal. With information from that same archive, 'Kok's secret' was also unlocked. In order to better conserve the decorations, he turned the traditional process around, ordering the biscuit heating (of the bare shard) to take place at very high temperatures, up to ca. 1500 degrees C, while the polish heating (of the glazed shard) took place at a lower temperature. Ergo, we can qualify eggshell porcelain as porcelain, on the grounds of the baking temperatures.

    See all
    Vintage JOHNSON Bros. OLD BRITAIN CASTLES Brown Multicolor Ironstone Dinnerware
    Vintage JOHNSON Bros. OLD BRITAIN C...
    Vintage Fiesta #6 Green Mixing Nesting Bowl With Rings Fiestaware
    Vintage Fiesta #6 Green Mixing Nest...
    VTG Johnson Brothers Old Granite Fruit Sampler Various Dinnerware England 1970s
    VTG Johnson Brothers Old Granite Fr...
    Vintage Fiestaware 6
    Vintage Fiestaware 6" Bread & Butte...
    Vintage JOHNSON Bros. OLD BRITAIN CASTLES Brown Multicolor Ironstone Dinnerware
    Vintage JOHNSON Bros. OLD BRITAIN C...
    See all


    1. vetraio50 vetraio50, 11 years ago
      Thanks for sharing these immaculate pieces, Bert!
    2. Bert Bert, 11 years ago
      Thanks Kevin and you are welcome;-)
    3. artislove artislove, 11 years ago
      another true work of art i love it!

    Want to post a comment?

    Create an account or login in order to post a comment.